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A colorless, nonvolatile solid, XeO3, explosive when dry: in solution it is called xenic acid.

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Oxide

A binary compound of oxygen.

Line Spectrum

An atomic emission or absorption spectrum.

Heterogeneous Mixture

A mixture that does not have uniform composition and properties throughout.

yttrium

A rare trivalent metallic element, found in gadolinite and other minerals. Symbol: Y, at. wt.: 88.905, at. no.: 39, sp. gr.: 4.47. Cf."rare-earth element."

Yttrium has a silver-metallic luster and is relatively stable in air unless finely divided. Turnings of the metal, however, ignite in air if their temperature exceeds 400oC. Yttrium oxide is one of the most important compounds of yttrium and accounts for the largest use. It is widely used in making YVO4 europium, and Y2O3 europium phosphors to give the red color in color television tubes.

Equation of State

An equation that describes the behavior of matter in a given state, the van der Waals equation describes the behavior of the gaseous state.

Energy

The capacity to do work or transfer heat.

Compressed Gas

A gas or mixture of gases having, in a container an absolute pressure exceeding 40 psi at 21.1°C (70°F)

Stoichiometry

Description of the quantitative relationships among elements and compounds as they undergo chemical changes.

Biodegradability

The ability of a substance to be broken down into simpler substances by bacteria.

 

S Orbital

A spherically symmetrical atomic orbital, one per energy level.